The trade war further escalated when [Canada](https://www.newsbytesapp.com/news/world/canada) announced plans to retaliate against US tariffs with levies on US dairy products and other goods, plus higher electricity prices.
In return, Trump threatened to double the metals charge on Canada and warned of dramatic additional hikes if Ottawa didn't relent on its protectionist policies intended to protect the country's dairy industry.
He claimed these levies would "essentially, permanently shut down the automobile manufacturing business in Canada."